jcs.org
Serenity Operating System
1/*
2 * Copyright (c) 2021, Tim Flynn <trflynn89@serenityos.org>
3 *
4 * SPDX-License-Identifier: BSD-2-Clause
5 */
6
7#include <LibGUI/Event.h>
8#include <LibWeb/DOM/Document.h>
9#include <LibWeb/DOM/Element.h>
10#include <LibWeb/Layout/Label.h>
11#include <LibWeb/Layout/LabelableNode.h>
12#include <LibWeb/Layout/TextNode.h>
13#include <LibWeb/Layout/Viewport.h>
14#include <LibWeb/Painting/LabelablePaintable.h>
15
16namespace Web::Layout {
17
18Label::Label(DOM::Document& document, HTML::HTMLLabelElement* element, NonnullRefPtr<CSS::StyleProperties> style)
19 : BlockContainer(document, element, move(style))
20{
21}
22
23Label::~Label() = default;
24
25void Label::handle_mousedown_on_label(Badge<Painting::TextPaintable>, CSSPixelPoint, unsigned button)
26{
27 if (button != GUI::MouseButton::Primary)
28 return;
29
30 if (auto* control = labeled_control(); control)
31 control->paintable()->handle_associated_label_mousedown({});
32
33 m_tracking_mouse = true;
34}
35
36void Label::handle_mouseup_on_label(Badge<Painting::TextPaintable>, CSSPixelPoint position, unsigned button)
37{
38 if (!m_tracking_mouse || button != GUI::MouseButton::Primary)
39 return;
40
41 if (auto* control = labeled_control(); control) {
42 bool is_inside_control = control->paint_box()->absolute_rect().contains(position);
43 bool is_inside_label = paint_box()->absolute_rect().contains(position);
44
45 if (is_inside_control || is_inside_label)
46 control->paintable()->handle_associated_label_mouseup({});
47 }
48
49 m_tracking_mouse = false;
50}
51
52void Label::handle_mousemove_on_label(Badge<Painting::TextPaintable>, CSSPixelPoint position, unsigned)
53{
54 if (!m_tracking_mouse)
55 return;
56
57 if (auto* control = labeled_control(); control) {
58 bool is_inside_control = control->paint_box()->absolute_rect().contains(position);
59 bool is_inside_label = paint_box()->absolute_rect().contains(position);
60
61 control->paintable()->handle_associated_label_mousemove({}, is_inside_control || is_inside_label);
62 }
63}
64
65bool Label::is_inside_associated_label(LabelableNode const& control, CSSPixelPoint position)
66{
67 if (auto* label = label_for_control_node(control); label)
68 return label->paint_box()->absolute_rect().contains(position);
69 return false;
70}
71
72bool Label::is_associated_label_hovered(LabelableNode const& control)
73{
74 if (auto* label = label_for_control_node(control); label) {
75 if (label->document().hovered_node() == &label->dom_node())
76 return true;
77
78 if (auto* child = label->first_child_of_type<TextNode>(); child)
79 return label->document().hovered_node() == &child->dom_node();
80 }
81
82 return false;
83}
84
85// https://html.spec.whatwg.org/multipage/forms.html#labeled-control
86Label const* Label::label_for_control_node(LabelableNode const& control)
87{
88 if (!control.document().layout_node())
89 return nullptr;
90
91 // The for attribute may be specified to indicate a form control with which the caption is to be associated.
92 // If the attribute is specified, the attribute's value must be the ID of a labelable element in the
93 // same tree as the label element. If the attribute is specified and there is an element in the tree
94 // whose ID is equal to the value of the for attribute, and the first such element in tree order is
95 // a labelable element, then that element is the label element's labeled control.
96 if (auto id = control.dom_node().attribute(HTML::AttributeNames::id); !id.is_empty()) {
97 Label const* label = nullptr;
98
99 control.document().layout_node()->for_each_in_inclusive_subtree_of_type<Label>([&](auto& node) {
100 if (node.dom_node().for_() == id) {
101 label = &node;
102 return IterationDecision::Break;
103 }
104 return IterationDecision::Continue;
105 });
106
107 if (label)
108 return label;
109 }
110
111 // If the for attribute is not specified, but the label element has a labelable element descendant,
112 // then the first such descendant in tree order is the label element's labeled control.
113 return control.first_ancestor_of_type<Label>();
114}
115
116// https://html.spec.whatwg.org/multipage/forms.html#labeled-control
117LabelableNode* Label::labeled_control()
118{
119 if (!document().layout_node())
120 return nullptr;
121
122 LabelableNode* control = nullptr;
123
124 // The for attribute may be specified to indicate a form control with which the caption is to be associated.
125 // If the attribute is specified, the attribute's value must be the ID of a labelable element in the
126 // same tree as the label element. If the attribute is specified and there is an element in the tree
127 // whose ID is equal to the value of the for attribute, and the first such element in tree order is
128 // a labelable element, then that element is the label element's labeled control.
129 if (auto for_ = dom_node().for_(); !for_.is_null()) {
130 document().layout_node()->for_each_in_inclusive_subtree_of_type<LabelableNode>([&](auto& node) {
131 if (node.dom_node().attribute(HTML::AttributeNames::id) == for_) {
132 control = &node;
133 return IterationDecision::Break;
134 }
135 return IterationDecision::Continue;
136 });
137 return control;
138 }
139
140 // If the for attribute is not specified, but the label element has a labelable element descendant,
141 // then the first such descendant in tree order is the label element's labeled control.
142 for_each_in_subtree_of_type<LabelableNode>([&](auto& labelable_node) {
143 control = &labelable_node;
144 return IterationDecision::Break;
145 });
146 return control;
147}
148
149}